/Engine/Plugins/Experimental/MeshLODToolset/Source/MeshLODToolset/Public/Tools/GenerateStaticMeshLODAssetTool.h
This function is called provide set of available group layers
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)() [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > GetGroupLayersFunc()